Splitting a big termbase into separate category groups/languages

A question to fellow Multiterm users: I am about to start a termbase that can potentially get huge in the future. Should I assume it will be easy to split it in half into separate category groups (say, T1: A–L and T2: M–Z) or languages, or should I rather create 2 or more separate termbases in advance to avoid any possible bugs/problems and spare myself the process?

Also, what is the estimate for a number of entries that would make for a huge termbase & a cumbersome translation process?