If you need more than the new MBPro, PRICE is not the problem; it's lack of POWER.
I would gladly pay over $5,000 US for an updated Mac Pro or MBP with 32 GB RAM. If you are making a living off this machine, spending an extra $1,000-$2000 every 3 years for your main tool (compared to a laptop) should not be a problem. Yes, it's a niche within a niche, but if Apple is one of the world's largest companies, with many billions in Cash, they ought to be able to do ALL of these things at once.
I sometimes need to auto-process a folder containing 10+ GB of hi-res photos, opening each one in Photoshop, downsampling it, converting it to CMYK or RGB, and then re-importing it into InDesign; or creating multiple hi-res PDFs of large books full of hi res images. I have several of these types of processes that run via a script or plugin, and having a faster CPU would speed up these tasks. I'd pay extra to speed those things up - but Apple's current products are not upgradeable. The old MacPro big aluminum tower was great - I could open the side, add RAM, hard drives, video cards - all within 5 minutes.
Apple needs to offer a machine that isn't meant to be used at a coffee shop. Those of us who need the power will pay the higher price.