Yes, we're anticipating more spiky workloads because of this. Deno Deploy is already designed to handle spikes, but we also have a few additional mitigations in place for Cron. For example, we will limit concurrent dispatches for the same project/user/organization, which may slightly delay the execution of specific cron tasks.
Or add a default randomness factor that makes it run within a certain time (like 60s or 5m) of the target, perhaps with an additional charge to run at the exact time if people have that requirement.