It could be possible as we are now straying away from the reason why we wanted Bitcoin in the first place which is that this cryptocurrency promotes fast & cheap transactions and is fairly accessible to anyone. Right now, the transfers are really expensive as compare to other payment methods like Paypal; where it does not charge anything to the Buyer/Sender of money. Another thing to consider is the transaction speed. The transaction fee may be cheap, however the confirmation takes so long to be processed. This disregards the purpose of Bitcoin being fast so it's basically impractical for people to have Bitcoin because the incurring additional costs will be more than what you'll give or transact with.
No one is going anywhere. I don't believe it. The increase in costs will lead to that users will be forced to use more Fiat. In addition, you can always exchange to exchange bitcoins for Fiat. The high price of transactions will be to force users to make fewer transactions. This will reduce the load on the network. The miners will also get less income. Perhaps this should encourage them to dialogue with the developers.