Cs:go question

I assume they'll stop being dropped at the end of the winter event, maybe even when Operation Bravo ends on the 4th. They should still be able to be sold on the market though, since the regular cs go case (case 1) is still on the market and available for purchase and it hasn't been dropped in game in months.

there will still be keys in the market and who knows they might allow the regular keys to open the crates

Similar to the first series crates, I'm sure they will still be available, but they will no longer drop in game.

I'm pretty sure they won't get deleted

Valve does not delete crates, only discontinues the drops. About the keys, don't worry as well. For example look at the TF2 store page - there are ton of different keys there for crates that no longer drops.

Thanks!!