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His question is whether a pitcher whose ONLY ability is groundballs has much staying power for the future. The core concept here is investment.
Halladay for sure he would not classify a groundballer - you wouldn't call Michael Pineda a finesee pitcher because of a sub-3 walk rate. Halladay's strikeout rate was 8.5 per game last year.
Sure, if James Paxton wants to get 50% groundballs with his 8-9 strikeouts a game, we have no complaints about that :- ) but he still won't be the "groundball pitcher" we're talking about. Those are the guys who pound the knees at 91 mph, say "go ahead and hit it" and try to control the damage.
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