It's impossible to be 100% sure in crypto. As you say though, previous rises have had alts taking over as soon as bitcoin slows and starts to stabilise. This rise has been going on for a while, but bitcoin is still leading the way. We will see what happens, but the past is only ever a rough guide, it doesn't have to happen again. Personally I think we will have an alt run, but I'm probably about 70% sure.