With regards the 'Solo' option - this is the whole point, we would then lose render nodes and floating licence, so it becomes much more expensive than Premium if you want those features back ...
A lot of us indie's have more than one PC that we use for DR or with Pulze etc so the render nodes that we got as part of our monthly subs back in the day are essential. Also, as an indie, by nature you can work from anywhere, it's great having Corona installed on your main PC, but then having a floating licence so you can also pick up your laptop and go work from wherever whenever. You lose both of these things with Solo. So you're forced to take the Premium option because it's cheaper than Solo + Render node + Render node etc, but then you're paying for premium and the price of premium includes Cosmos and all that Jazz.
There's no middle ground. We need a middle option for Floating Licence plus Render Nodes minus Cosmos, Phoenix etc etc. Call it Solo Plus or whatever you want.
Floating licence - you are right - nice thing to have, so: you get some, you loose some. I would consider pricing from Chaos being quite reasonable considering its position within the market. Look at Redshift and Octane (bit cheaper) - priced in relation to Corona exactly the same as Corona is to VRay (VRay being 50% more expensive; sure, both are GPU but GPU is just the right choice for small operations for some years now - licences cost vs hardware scaling-up cost)
And be mindful that those legacy deals with 3 render nodes will not last forever. Nothing does. Just business, nothing personal.