You Have only listed the recent reboots. There must be many more games that received the reboot or remake treatment, whether as a continuation or remake of the original game. Such as Ninja Gaiden, Bionic commando, Metal Gear (solid) and other NES classics who were converted successfully to next generation platforms.
If reboot stands for retelling the original story, then it's recently very popular not only in gaming, but also in cinematography (A LOT). The formula is basic: they take the old movies and games we all knew and loved, and remake them, pumping them up using the most modern technology. It's basically your memories, UPGRADED with awesome graphics and sound. In other words, 'tis just like the original, but bigga! And stronga! and in HD!!
Does this make it better? Hardly so. Most remakes of films are regarded as inferior to the originals. Can you say the same about games? Hmmm.