The landscape may change in a few ways.

We may have dedicated (more centralised) relays to query only metadata events (kind 0/3/10005).

We may have dedicated indexing/aggregating relays (we have today, but used as generic relays) when you have little more than an event id. These could include event aggregates stats data.

We may have archival relays that host older content. Query if event is expected to be older than 3 months for example.

We will continue to have mass broadcast relays, when events need maximum reach.

And likely other specialty relays or services - like perhaps caching media from events like images that may break in the future.