No, it should not scare you and your reasoning is rather narrow minded,
You are panicking for nothing, every company starts developing their next console a year or two after they release/launch their current console, Nintendo won't abandon Wii U and they are not Sega to begin with.
Wii U will be supported for at least another 4 years.
Expect 3DS successor in 2017 or 2018 and expect Wii U's successor in 2018 or 2019.







