Trust me, it will get there. I wager we will see a $5K floor, yes floor, by the end of 2020. Supported by miners and by true long holders. Bitcoin will be seen as the only sensible crypto and the true value play. The price of bitcoin will of course continue to increase into the future, but likely more slowly over time. I guess we shall see. 99.99% people have yet to even buy some.
All the other shitcoins are supported by nothing but the pumpers and FOMO hype. When all that changes, and it will someday, the ICO market will get fully labeled as 'SCAM MARKET' and the sensible people will never return there again. They can only pull off the mega scam once.
The supply of bitcoin by the end of 2020 will be at least 18 million BTC. That's 87.5%. The year after that is another block reward halving to 6.25 BTC per block. The year or two after that, another train or rocketship or moon or mars or whatever.
2030 is a much nicer year to forecast, it's in the middle of a block reward cycle and we will have 99% of all bitcoins, so ... bitcoins won't increase at that point (yeah, 1% over the next hundred years) but users will ....
ICO market is going to stick around at least another 2 or 3 years. Fortunes will be made (both by the founders as well as normal participants.) If not ICOs, then the "normal" altcoins that come about just by mining them, airdrops, country coins, business coins, and private coins.
The thing you forget about "sensible people" is that there are "non-sensible" people born every minute, or come into this space. I argue that my estimate of 2 to 3 years is conservative and as long as there are people, as long as they think "so, there's a chance" ... ICOs or some variation of them will continue to exist.