what do you mean? The blockchain grows exponentially? Too big? I dont think you know how it works !
Monero VOLUME of coins is not exponentially growing, is that what you thought?
Monero is virtually finite, it will take like 100 years to double and then 200 years to double again so its inflation rate is so small and honestly for all intensive purposes, the monero supply will be just as finite and limited as BTC! And Monero just gets WAAAY more freedom for anonymity!
But have Both! I am not telling people to sel all BTC for Monero but you should at least own 1 monero if you can while they are still cheap under $100 !