Personly I think 3rd Gen remakes are a bit unessesery.
They did Gen 1 and 2 remakes because they were the original story and the only games Satoshi Tajeri originly planned.
Even though Ruby was my first game, Looking back on it. They were probably the weakest game's in the series. The tone completey different from the first 2
gens and the inability to catch a lot of older Pokemon. Also a huge step back from GSC as there were no day and night or days of the week.
The only good features they added were abilitys and the new EV system. apart from that, they were extremly forgetable.
Just me though, the amount of people wanting Hoen remakes probably means they will happen. I just think they would be a waste of time.