I do not agree with the bubble part, or with the statement that the bull run has already started, or that BTC will be replaced soon...
Maybe we are now on a bull trend, prices and volumes are way much healthier, but there is still a long way to go before we can call it bull run...
And BTC replacement... nothing lasts forever, and I feel BTC is falling behind, sitting on the shade of the past success... there are a lot of new alts showing high promises... but I think it is still too early to say that there will be a replacement for btc