Roo Man,
Great question. And my answer would be yes, a driver may lose to a blocker, but at the same time still deserve the title. In today's day & age parts breakage can be a deciding factor in a race. One need look no further than the CSK Nationals in Arizona to see an example of it. Tony Schumacher was running .40's like a bracket car until a throttle linkage broke in the semi's. I submit the better car did not win that race. Please don't misunderstand me, I accept it for what it is (was) and so do the racers - it's a fact of life and of racing. But for that to happen against a 'blocker' in the last race of the season would be a shame - especially if it determined, or helped determine the outcome of the 'season long' championship race.
In my humble little mind, a team owner hiring someone who hasn't raced all year and putting them in their team's spare car specifically in an attempt to take out his/her primary driver's closest competitor so said primary driver can hopefully win the championship is, at best, questionable. It's not illegal, nor are there rules against it - this is simply one man's opinion - mine.
If, however, Steve Chrisman (as merely an example, use Mike Strassburg if you want) takes out Doug Kalitta or Tony Schumacher in the first round and Tony or Doug goes on to win, then it was straight up racin' and the year long contender won straight up.
And I hear what you're saying about the old days - just ask Ed 'Ace' McCullough, he'll tell you all about it too. But these ain't the old days.