This is not at all correct, at least among the general D&D gaming community. Data from character-gen sites routinely ranks sorcerer among 5e's least popular classes, with the latest Beyond figures putting sorcerer second-to-last in popularity. By comparison wizard is the third most popular despite having a similar spell list, which tells you it is very likely the design of the sorcerer class that is causing its unpopularity.First, what is wrong with Sorcerers as written? They are already a popular choice at many tables.
I'd argue their main problem is not that they are weak but that they have no clearly defined role in an edition where wizards can spontaneously cast spells. Basically the wizard killed the sorcerer and took his stuff, and the 5e team failed to come up with a compelling new take for the class.