I think its quite amusing how many threaten the game developers with "I will never play again, you will never see any more money from me".
That being said, here is my opinion:
From what i gathered here there is a kinda big party that wants to play solo, I would count myself to them. I like flying around, trading and absolutely hate the idea of a pvp player - who is of course much better equipped and skilled in PVP than I am - to disturb my experience. I wouldnt mind having a single player game with my own universe, but I guess that is out of the question. I dont even want to know what kind of computing power I would need to run this universe the way its run on the servers. I am pleased with the state of the game of course, as there are no real disadvantages for me at the moment. For me that would change if there were benefits for playing open, as I would feel pressured to do something I dont want to do. The "extremists" in this group would consider stopping to play the game if solo mode were no longer availabe.
Second group would be open players. Some are in it for PvP only, some like a challenge from time to time, others like community based games and try to make friends I guess. The pvp players dont seem too pleased with the state of the game as there is just not enough PvP for them. The discussion was also most likely started by PvP players. The arguments are unfair advantages by being able to switch from solo/open and lack of players in open in general. They seem quite sure it would fix their problems if the choice was either not there or everyone was forced to play open. I guess some are already considering to stop playing if nothing is changed.
Third party would be the guys actually switching modes regularly. There are of course advantages to this. Its easier to grind credits by trading, no question about it. Its also nice to play the way you want or what you are in the mood to do. These guys wouldn't appreciate a change too much, as it leaves only pretty options open for them. They could play open only, something they seem to fear or consider too hard/dangerous in some situations or they could play two accounts, one for solo one for open. Thats not a real option in most cases though I guess. The open account would either starve as they wouldnt do much trading there or they would have to invest a lot of time to get both accounts to a level they feel comfortable with. I guess it would force most of them to play open (good for the pvp players) but as they might be bad at taking big losses some might quit the game altogether after losing a big haul or two.
I dont think there is much to gain by changing the way open/solo is handled. If it is changed other players will be unhappy and there is no way to tell (at least for us) what the majority of the players are doing.. I dont think the situation for PvP players would change too much by removing the ability to change modes. Removing solo mode completely would be unacceptable for me and other players (especially considering offline mode was canned already). PvP players would be happy for some time I guess. I dont think this would last though.
It will certainly not stop the discussions.
In my oppinion this is no solution to the problem. It would be better to try to make the pvp players happy some other way. Lets have the imperials host the grand galactic arena games or something to please them. That might actually help.
PS: Maybe roleplaying pirates are worth mentioning, too. I guess some (or a lot?) want more loot and might like easy targets. I think the major flaw with pirating is that the npcs cant punish them. As I understand it, there is absolutely no chance that a skilled player is shot down by npcs while pirating at the moment. If open was forced there should be done something about this as well. The authorities should have a way to engage these players with a decent chance of success. A military that cant even hunt down one pirate who destroyed dozens of ships in their jurisdiction is kind of bad, isnt it? I am thinking about something like interdictor cruisers with small, fast fighter crafts you cant easily run from.