I doubt I would (if I still had a laptop), but I also don't doubt others would like it.
Same goes for LTE on iPad - I'd rather not have the extra plan, and my iPhone's hotspot works just fine. Others, of course, appreciate having LTE on their iPads.
Somewhere along the line, the entire PC industry seems to have come to the conclusion that LTE in laptops is not a mainstream desire. Since they're not likely to ignore a compelling feature that could increase the selling price, the consumer and/or institutional interest must be pretty small (focus group testing, surveys of IT managers, etc.).
What's interesting is that LTE in tablets and wearables clearly addresses a significant consumer demand/desire. Why one, but not the other?
I'm not sure battery life would be a major concern. Laptops have far greater battery capacity than smartphones and most tablets. The amount of power necessary to run an LTE radio is the same, regardless of battery capacity, so LTE would be a smaller percentage load on laptop capacity than it would be for other mobile devices.