As much as I know it was a mistake to fire Thomas and that they should bring him back what really saves the show for me is Garcia & Reid. I do think his departure will take a hit on the ratings though.

For me it's a "maybe". Many great characters have come and gone, but as long as the storylines and characters remain good, I'' probably keep following the show.
^ ...and you're not the only one who loves Garcia & Reid. If one of them goes, that might actually make me change my mind.

Hotch and JJ are my least favourites, so....

JJ is my favourite character by far, following that is Garcia and Reid. So unless those three left I wont stop watching, and even if they left I would probably still watch. Hotch on the other hand I have never really been a fan of.

I can't say 'no' for sure because I do love Reid, Garcia, Rossi, and JJ, but without Hotch... He may not be top favourite (that would be Reid) but on a list of characters they just can't do without I would put Hotch at number 1. This is a pretty huge blow...

I'll give it a try.

but i really hope he coming back, he is one of my 4 favorites <3

First of all, watch the new episodes of season 13's Criminal Minds. Then, quit watching the reruns without Thomas Gibson as Aaron Hotchner.