Yeah true, we are really hoping that starts soon because we all expected it to happen one way or another and by the looks of it we are seeing some situation changing with time, not a lot of people realize this but this hyped new one could be bigger than anything else we have seen.
Not because of the amount of money to be made, bitcoin can't go up 1000x like it used to, of course we won't be making that much money (at least not from bitcoin itself) but the growth and legality of bitcoin is at all time high. We literally have that ETF that we have been waiting for, you know how long that took? This is why I believe that we are going to go up for a while longer when this bull run starts, and I am expecting a big increase for sure.
The returns in this bull run will be insane but within the realistic limits. As you mentioned we will not be able to see 1000x gains not only in bitcoin but also not possibly in altcoins too.
Some analysts have this point of view that previously the money flows from bitcoin to large cap altcoins and then to the small cap altcoins but this may not happen this time as the money going through ETF won't be going to altcoins and it is only the bitcoin that will be strong in this bull season. We are yet to see how the market behaves but still, it will be a good time to make money for both the bitcoins and the altcoins investors.