Altho not in favour of removing it.. it could be fun having 1 week a year where there is no rebuy.
GALAXY WIDE PURGE!!!
This.
It think it would be a good idea to at least test this idea. If it increases engagement in the game, particularly in OPEN I would be all for it.
Another take on this could be to link rebuy to combat rating. A higher combat rating modifies your rebuy down. A bit like "no claims bonus" for your car insurance.