It seems to me that if the problem of scalability of bitcoin is solved, then this cryptocurrency will be indispensable for the entire cryptocurrency market as a means of payment, a valuable asset for investments and international currency for international trade. In addition, it is very important that when using Bitcoin, no one can abuse it like governments do by printing new money. Perhaps one of the most important values of bitcoin is its limited amount.
I doubt that "the problem of scalability of bitcoin" will ever be solved. The core protocol should remain unchanged so that the level of security it provides wouldn't fall significantly. The core blockchain of bitcoin is not suitable for everyday payments, but it's perfect for storing a value. When one use any asset as store of value, this asset is not moving whatsoever. Basically, bitcoin transactions will be used as final settlements like it's happening now in Lightning Network. Eventually, fees will be higher because most of everyday transactions will propagate off chain, but final settlements and rare movings of value should serve as incentive for miners.