The problem is we're 1 match into the season where Dybala didn't even start, yet people are screaming for attacking options...
Allegri is simply protecting him like he did with Morata. And like Morata there's a good chance he will start shining for us in a couple of weeks/months.
And besides we wouldn't have lost the game with Marchisio in there. Add to that we are about to obtain the services of Alex Sandro, Asamoah, Cuadrado and one more incoming transfer. That's 5 possible starting players. 5 as in FIVE. If you add Khedira later on, that even makes 6. 6 as in SIX. We do not need another attacker, if anything, we need to offload one soon.
What we missed was an attackingly dominant midfield, which we'll regain with Asamoah, Marchisio, Khedira etc...