I'm completely baffled now...
He said he was sorry that you're unhappy, which is true (I'm sure) and entirely reasonable.
He isn't sorry for his product, and I don't blame him, because many users are happy with it (otherwise it wouldn't be selling). I like it, for example, and use it quite often. Way more often than I use PDFPen, for example, which cost double the price of MC. Do I wish it was even better? Sure! Do I wish the Windows version was even better? Also sure! But am I entitled? No. That's not how it works when you buy stuff.
I also don't think he should feel sorry for the progress they've made. Considering challenging circumstances for the past 5 1/2 months, they've made some decent progress. As much as they would have had Matt not gotten hurt? No, probably not, but decent.
I understand the impatience, but a product is what a product is. You bought a product, not a share in the company. It reminds me of the people who got all offended because they bought an Oculus Rift on Kickstarter and then they sold to Facebook and (I guess) people were ticked because they felt like they had some kind of ownership of the company or something? No, they bought a product. They got that product.
Same deal here. If Theater View being developed during this product cycle was essential to you, then you were dreaming from the get-go.
To be clear, Theater View is essentially a complex 3D game completely written in Direct3D. You cannot run Direct3D on OSX, and have to use OpenGL instead (which is substantially more complex, which is why games don't come to Mac as quickly or ever). Porting Theater View to OpenGL is a massive project, that would probably require substantial time and dedicated developers over months (and perhaps years). This would negatively impact all other development on the product in the interim.
As I said, I think it is a long-term goal. But, there are much more pressing fires right now.