I'd expect to see a lot more friendlies as the gate revenues drop (either from discounted tickets or from lower overall sales).
That said, the more I think about it, the more I realize I don't think that matters. Even with higher ticket prices and a sold out stadium, I think these friendlies would continue. As supporters, we look at TFC as our team - but tend to forget the reality of things. MLSE are a business, and TFC are a product that MLSE sells. From that perspective, the friendly is an additional opportunity to see that product and make more money. Even if we go back to the days of a sold out stadium and high prices, would you expect a business to say "I have made enough money, and therefore I will turn down this additional opportunity to sell my product and make even more money"? Not very realistic..
It happens at all levels. Big teams get paraded around the world in the off season to make more money. It doesn't help prep them for the season any more than staying close to home. It's a pure cash grab.