Your questions are quite contradictory but however, it's not only large institutions that can afford the use of Bitcoin Blockchain due to high transactions fees because there are also individuals that have high amount of Bitcoins and wouldn't care about the transaction fees inasmuch as the system is decentralized.
Bitcoin was invented to be a decentralized currency so I don't see any reason or whatsoever that would tend to change the decentralized nature of Bitcoin regardless of high transactions fees or congestion in the mempool and moreover, recently we can vividly see that there have been a reduction in the congestion and transactions fees also reduced as well so hopefully with time everything is gonna normalize.
It is obvious that these congestion in mempool and high transactions fees have been a reoccurrence in the crypto industry and afterwards returns back to normalcy so it shouldn't cause a panic in anyway as the system would be restored by it's developers .