Me personally, I would go the other way around and here's my logic....
Which are you more likely to replace first, the flooring or the riser? My guess would be the flooring. If the riser is sitting on top of the tile and you replace the floor with something thinner, then you'll have to re-address or replace the riser to accommodate the lower flooring height. Also, if the riser is not "closed" and might be visible from the end then there is a higher possibility you may see any gaps or height difference and it may become problematic to "hide".
We run into this a lot today where people installed laminate and they are now replacing it with a glue down or thinner LVT. It creates some real head scratchers.
Either way is completely fine. Just trying to save a possible future headache.