Historically Portugal always sucks in qualifiers and performs at a much higher level in competitions. It'd be a shock if we didn't make it out of groups even without Cristiano, which I doubt is a scenario. If Ronaldo doesn't play against Germany it's a rather non-issue, as Portugal likely would have trouble winning that game anyway. As long as we make top 2 we're happy, and beating USA and Ghana should be expected even without Ronaldo, but anything can happen.
Some have rather hilarious statements about Ronaldo's performance on the national selection too. In tournaments he always does well. In Euro 2012 he basically carried Portugal alone in all the matches we won, and did a phenomenal job. We fell short to Spain in a close game where Portugal actually had the greater goal chances besides Spain's one big chance which resulted in a goal and 1-0 victory. IMO no team came close to showing the same level of resistance vs Spain in that Euro. The Spain v Portugal match was the best match anyone played vs Spain.