Let me preface this by stating that much I'm about to post, I've learned from my 18 month old boy.
Aside from the sentimentality of a parent watching his kid develop physical and mental abilities, it's a very interesting phenomenon watching the way the development occurs.
Kids basically learn one of two ways: imitation and exploration. Imitation being quite simple, so I'll move right on the exploration. Now, there's recently been a lot of discussion whether kids in America are being hampered by overprotective parents. I believe that notion is quite correct.
My son has legos, but he also has access to my touchpad and android phone. To him, they're not so different. Legos teach him that he can piece them together to make new things or break them apart for the components (creativity). The electronics teach him that there is a logical action and reaction (logic).
It's absolutely amazing the first time I saw his eyes light up because he figured out how to wake the device from sleep or how to unlock it. It's a physical indication that a neural connection has been made in his head. To me, that indicates these types of tools will indeed facilitate a much earlier exposure to logic we have not seen in previous generations.
So to come full circle, I don't think the death of legos (I don't really foresee it happening) will hamper our kids because there will be other mediums. As long as we don't hamper exploration, kids will develop both creativity and logic.