On average, I touch the touchscreen around 2 times a day (coinciding with the start of my commute in the morning and evening) only to change the Slacker station under my Favorites. On some days I don't even do that. I used to touch it more to enable the heated steering wheel and/or seat, but recent updates have enabled that setting to carry over, which is great. I use the steering wheel controls to skip songs and make calls, as well as my phone mounted right next to the steering wheel for quick read/reply to emails and messages, a lot more often.
The point is, I couldn't care less about a faster MCU. What I have now is way more than sufficient for what I need. And I also couldn't care less what the resale value of my car is as I'm planning to keep it for at least the next 3-4 years. Who the hell knows what will happen at that point? There are other better things to worry about in life. But to play along, whenever I decide to sell it, if a potential buyer is really OCD about having the new MCU, not sure if they'd really be interested in my car anyway. But I'm not in the slightest worried about there being other buyers who also similarly couldn't care less about having the new MCU based on their needs.