So if the user aren't aware of coin control and no nothing about Consolidating UTXOs, that will have no impact on the use and also this does not suggests a bad future for the bitcoin.
Coin control is not important only for consolidating inputs. UTXO management is very important for privacy reasons too. Essentially coin control is like managing the dollar bills in your wallet. Would you pay for potatoes with a $100 bill? Probably not. What I mean is, it is much better to know how to do coin control rather than not. It doesn't suggest a bad future for the bitcoin, but rather a bad future for the coins' owner.
Many people even does not know that once they spend a certain bitcoin to a wallet, the rest of the coins are send to a change address. If this information is known to people, they may think of using the coin control feature much more than they are using it right now.
The only thing which the majority of people are concerned about the Tx fee they would need to spend and most of them even do not know the reason for the high transactions fee is that Bitcoin is stored in different UTXOs in a wallet and consolidating them at a time when mempool fee is low, can be a big money saver.