If we assume that PS4 and XB1 won't sell double the units PS3 and 360 did (easy to assume), then necessarily this gen is more front loaded, yes. It can't turn out any other way.
Now, what are the reasons for that? I'd say that last gen started with a lot of doubt and fragmentation. 360 didn't start that well, maybe due to the imminent launch of PS3. But then PS3 didn't deliver and also started poorly. Add the fact that the Wii was selling gangbusters and... a confused and divided market is bound to start slow, it wasn't until later that things were more clear and consumers more confident in their purchase.
This gen it's much easier for consumers to act. PS4 is dominant and the price is good. Xbox One is an alternative that has moved many sales forward by slashing prices heavily.
This gen's legs will be shorter, yes. Especially Wii U and Xbox One. PS4 at least has dominance, price cuts and developing countries to counter that somewhat but, percentage-wise, I bet it will also have worse legs than PS3 (not necessarily sales-wise).
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