For the record, I was told 5ish years ago that Websites was being moved to resources, which would allow better control of alerts.
It will, and it will also really help with reducing RBAC management requirements also. There is a migration requirement, so I believe the best approach is to provide either option, with the new resource websites being cost "forgiven" during a migration period of 3 months.
A migration tool would be good.
I'd also like to see Netscans work for websites/ping checks, as this could be used to integrate with website management CMDBs and IPAM tools to automatically bring assets into LM management.