Hi cohokc,
Thanks for getting in touch and for your interest in Events Calendar PRO. The reason that we have that notice in place is because that many recurring events can slow down a site. To make sure that the calendar loads quickly and fully for your users, we limit recurrence to 200.
We do not currently have plans to implement an End Never option, but if you’d like to encourage us you can vote for the topic via UserVoice. However, as noted there, adding this feature may not be possible, let along optimal, because it requires working with infinite data.
I recommend that you set your events to reoccur at the max (200) and then set a reminder via another service that will help you remember to reset the event recurrence in another 3 years or so 🙂
Best,
Leah