I don't think it's a brick wall insomuch as Intel (and the rest of the industry) is focusing on IoT devices and low-powered SoC solutions for edge computing devices. It's too soon to say for sure, but the trajectory looks to be that an ever increasing sales of cloud/server infrastructure as the Core series could get squeezed out of market share in favor of, say, ARM architecture.
Without getting prohibitively expensive, Intel needs to move volume of Core chips into the market in order to keep the costs down (because chip fabs are expensive!) for their high-end gaming consumer CPUs. At some point, the next generation of PC gaming CPUs might be from the Xeon lineage should Intel decide to deprecate the Celeron, Pentium, and Core architectures.