Terry, Oh, the world may be changing, but not that much.
You see, I am all too well aware of the trials and tribulations in converting over to Orcad or other software. Lets just say I had a 'professional' interest in it!
But, if you are just starting out, or are just a hobbyist, then of course, you don't have much to loose going over to new software. But, if you are a professional (and, many of us here ARE professionals!) then that transition is full of wasted time 'reinventing' the wheel as you realize that it will take 'x' amount of time re-drawing that basic filter block into the new software, or having to confirm that the simulations in the new software match the results of the old software. A professional doesn't have time to manage two separate design flows, unless the payoff is much higher than maintaining the old system, i.e. and order of magnitude or more!
And, if you are a company, and not just a single professional, the cost/benefit has to be even HIGHER to warrant a change.
Charlie