Altcoin investment for 1 year is not a bad idea. This is a common length of time to decide for a certain coin if it would survived in the market. I think it would be better to target time like that compared to 5-10 years.
It is actually a very sensible thing to do most of the time when you have been able to accumulate at the dip. Because buying at dips have a big advantage than buying in bull market. We can be sure about the bounce back which may happen at any time. I am speaking with good alts which are backed by live and promising projects.
One straight fact is that you obviously cannot know the best time they are all going to be having some pretty good growth or the level at which they will each be reaching in the long run, so the idea for me is to always accumulate the good ones, be patient enough to wait for them and sometimes their growth can even come around twice in a year, so I get to utilize those opportunities for a good profit.