It's all fiction and very debatable, hence why you would think that the forward triade is worse than what we have right now and why at the same time I rate them two or three times higher than our current one. Fact is no one can be sure unless we see them together in action, which won't happen in real life.
Based on the form and level of performances in last 12 months alone both my two picks are way better than Dybala and Morata, both are like 7 years younger than them and both have waay higher potential ceiling than what we see first hand week in week out for the last few years where our two players should be close to the top of their game, which they are not OR they really are and this is the best they can present and perform...
Both of those youngsters may or may not turn out great, top class and world beaters, but that doesn't change the fact that our current duo is nowhere near to be great, top class and world beaters so it really is a no brainer to me to choose and bet on a way younger "maybe" instead of the current "no", but that's just me. I could have easily picked Mbappe and Haaland instead of Gouiri and Vlahovic since it's all fantasy, but those two would never choose Juve instead of Real and Premiership, unlike the two 21 years old in mention...
And lastly, no, at least several clubs would be fine with a pocket change fee for those two players that you mentioned, hell they could go for even higher price, that was never a problem. The problem is that the players keep rejecting every possible offer that is presented to them, which is why next season we would have at least 2/3 of the players I put in the OUT category, which is why a much needed change or a revolution will not happen, which is why all this remains a prediction that is just a fantasy and waay far from the reality...
And again, if it wasn't clear enough, I would like to say that in my opinion both Gouiri and Vlahovic are players with greater potential than Dybala and Morata and both of them are already performing on a better level than Dybala and Morata, the two youngsters are superior at pretty much everything there is and I absolutely consider them an upgrade to Dybala and Morata, also they would be a much better fit with Chiesa than Dybala and Morata and so on, basically I am open and willing to further discussions about it, but not in the way of "remember how awesome Dybala was vs Barca in 2017 and how Morata was key in the 2015 CL run", that remains a fact, they were both amazing and awesome at some point, today they are not, today they are both inferior to those two 21 y old players and if it was up to me to decide on one of the two duos for tomorrow, I would bet on the younger one that performs better and has every chance to improve even further, unlike... yep, Dybala and Morata...