I hope you having a good day! I am finally starting new

Hey I hope you having a good day!

I am finally starting new hosting service with Pro Sites.
However, I want to ask you about the hosting environment with Multi- DB in advance.

I am now using shared server, and I will change it to dedicated server after user increased.
So, I don't have root access now.
So I know I can't use Multi-DB now.

So, I want to ask you about whether there is the limit to create sub-sites with 1 database.
According to your screenshot in Multi-DB page, it seems that 5,000 sub-sites are limit of this.
If I host over 5,000 sub-sites, what happen?

King Regards
KAZUKI