Unlikely due to some obvious reasons:
Matchmaking will take too long
Any Mega games which has 40 players already takes some time for it to be full imagine how much more if its 100 players
Matches will take too long
Trying to end a game is quite hard to do since there will be 50 players that will be defending their base and it may even take a 20mins or more just for one match to end
It may be very laggy
100 players in one match may be too much for one game to handle and it may even just close down midway
I would suggest maybe instead of 100 players make it 50 so its a 25v25 to avoid it being laggy or take less time to fill and when to stop games taking too long their eggs will be automatically destroyed at a certain amount of time