Why would he wait? It's not like they are coming tomorrow or next week or even next month.

Most cases already come with at least one fan for the cooling and, if the case has good airflow, that should be enough. Adding a second one (one intake, one exhaust) would make it better, but then it may be cheaper to look for a case that already has more than one fan rather than buying a case and fans separately.

If you have some worried about building the PC, there are plenty of articles (here's a couple of them from Tom's Hardware and PC Perspective) and videos that show every step needed. But it's easier than it looks as most parts have a foolproof design to prevent "accidents".

There is always better hardware coming on PC. Every 6-or-so months give or take as nVidia, Intel and AMD take turns in releasing.

If we were to wait on every new piece of hardware... We would end up buying nothing.

Always buy the best you can afford at the time, unless the new hardware is coming in just a few days/weeks.