It is all the seasons have been released on DVD. I have them all but im not 100% seasons 8 and 9 are not bootleg because it's a different publisher out of Maylasia. Either way you can buy them all easy online.
Tubi has everything all 9 seasons all the EQG movies even the YouTube specials like rainbow road trip. It's my go to for when I want to watch MLP online now.
So to answer the OP no, i think that MLP has a strong enough base that it will be available forever more or less... still would love a full blu-ray box set.