1. You clearly aren't familiar with the Tampa 2. It does not require massive defensive ends.
2. This offense is going to be a lot more explosive this year. I know you might not be able to acknowledge that, but you'll see it in action in a week. Romo has always been amazing when he has had 4 options to throw it to on a play. He might even have 5 options this year with Dunbar. That equals a lot of yards and first downs, even on checkdowns. He has a slew of dangerous 4th targets.
No, I am familiar with the Tampa 2. I'm also familiar with the fact that Ware was banged up late last year, and has been battling stingers since 2009. Spencer is coming off of a knee injury, and will be playing SDE at 255 pounds. There is nothing resembling quality depth behind them. Not only will they be playing more snaps than a year ago, they also will be taking on tackles down to down instead of occasionally playing in space as they did in a 3-4. If you don't think that this will wear them down, then you are a lot more hopeful than I am.
As for the offense, it's great that you are speculating that they will be explosive, but the proof will be in the results. Let's see how the line performs this year. Let's see if they can convert touchdowns in the red zone instead of settling for field goals. Let's see if they can average over 24 points a game, which they have not done in quite some time. They have some good parts, but they also did last year, and were very uneven offensively.
These are my feelings on the matter. Like anyone else's, they don't mean anything until the games are played.