If he's planning to hold again for few more years then sure once again he might experience a big price increase similar to the one that happened in a very short time of around 10 months time. By the next halving we can feel the 200 or more percentage of profit.
I said at the time of the halvening that'd it would lag in its effect and we did see that mostly. The coin price sold off afterwards ? Too many held it expecting some supply squeeze to take immediate effect. What we are seeing now is really the first echo of that reduced supply and its occurring now as its worked through stocks people bought up ahead of the news and now you just have the real price resulting from similar or even higher demand vs a supply that halved.
What I see in the price is quite surprising, its selling but not especially being weak. People are picking up coins on lower prices, some is genuine demand and its always mudded by speculators but thats how Im reading the price graph. I might just imagine it but it seems reasonable it can go higher
+250% - what else ? some silver mine shares have made this kind of gain. In 2016 oil price recovered, also gold and silver some