Yes, the tea leaves appear to be signaling a change in the wind.
The "Stovebolt Engine" pipeline is unfortunately drying up for good rebuildable cores and theres many folks that prefer to buck the trend of going SBC and stay unique with a 6 banger powerplant.
Example 1: The 54 235 I recently rebuilt was it's 1st major rebuild that required machine work. The cylinders had to be bored 0.060 over to be trued up. This means this is not only the 1st rebore but also the last rebore on this engine. I will add that the block can be rebored to an oversize to allow the install of sleeves but at that cost a SBC engine becomes a cheaper and better option. -or- a 230/250/292.
Example 2: I recently traded for an "in-progress" resto-mod 49 GMC 1/2 ton that someone had already replaced the original engine with a 78 250. Not being experienced on this particular generation of GM 6's I've spent many hrs researching them all over the WWW. I rarely had to leave The Stovebolt for info on the 216 and 235.
I have found that there is a wealth of knowledge lurking around here on the Stovebolt pertaining to this next generation of Chevy 6's that just may be waiting the means to share.
Inorder to promulgate an effective means of maintaining these self propelled Art-Deco, Advanced Design and Task Force motorized denizens of mechanized labor, the addition of the pursuit of knowledge on the next generation of powerplant is highly advisable.