Platinum is considering being a Second Party for Nintendo.

[JEMC]

I find it sad that some Nintendo only want Platinum to work on old Nintendo IPs instead.

Platinum could (maybe even should) be used as a "concept factory" to produce new IPs and games. Their members are talented and creative, something proven with the games they have created being Platinum and Clover, that would be perfect for that task. Sure, 2/3 of those games would flop, but even then they still would make some small hits that in the long term would greatly benefit Nintendo.