Huh?
Sir...Spiderman as a game, as they made it last gen is NEW, to really be asking for yet another new thing is imho a bit much.
Keep in mind, for all we know they already have a plan for a new IP. They started the PS4 generation with Ratchet and ended with Spiderman.
For all you know they start PS5 with Spiderman and Ratchet and end with new IP. So I see nothing here that argues "wasted potential", shit I'd say its wasted if they didn't make a trilogy of Spiderman.
So they are known to do new IP, like every generation.
PS1 Spyro.
PS2 Ratchet
PS3 Resistance (and....sigh, Fuze lol)
PS4 and XONE, Spiderman, Sunset Overdrive, Stormland, The Unspoken etc
Sir...I see no evidence that they will suddenly just keep making nothing but just those 2 IP, but for PS5 even if they did, I'd say they have earned that right to settle into 2 properties until they feel like moving on. Sony is one of the few publishers that gives great freedom for developers to move on to new IP, so I feel Sony and Insomniac are a great fit and I see nothing here even remotely to say anything is being wasted.