The Altaic language family does exist

The Altaic language family has been dubbed as a hypothesis called "The
Altaic hypothesis."
The reason behind all this is that the inclusion of Japonic languages and Korean inside this family are debatable.

The debate is not only scientific, but also carries political controversy with it. Research and sources also suggest a connection between Japanese and the Austronesian languages. I cannot comment on Korean in this case as I have read much less on it except for the fact that it does have agglutinative grammatical features like the Altaic languages. Such grammatical features are also common amongst many Native Siberian and Native American languages.

But even with questions and debates of weather Korean and the Japonic languages being Altaic or not or being a different form of Altaic, the general consensus remains clear: That the Turkic languages, alongside Mongolic languages and Tungusic languages do have a common origin and are established members of the Altaic languages family.

All the mentioned language subfamilies are genetically related to one another regardless of weather or not they are related to Japanese and Korean.
There are some sources that claim a closer relationship between the Turkic and Mongolic languages than with the Tungusic languages, but regardless they are accepted to be linked- and that's what most people seem to ignore.

Just because a few languages are not included in the family it does not mean the entire family is a hypothesis. So since Turkic, Mongolic and Tungusic belong to one family what else do you call it if not the Altaic language family?

This is the mistake many people including linguists seem to be ignoring. A debate(s) weather to include one or more languages inside a larger established language family should not turn the entire language family into a "hypothesis."
The language family is there. Weather or not these mentioned languages belong to this family or not is a different issue all together and does not affect the already established language family.

Therefor I want to clarify this ongoing confusion that the Altaic language family does exist, but it is arguable weather Korean and/or the Japonic languages do actually belong in it.

This is the reason for the chart below to have a broken line when linking the Japonic and Korean languages to Proto-Altaic to clarify that the link is a supposed one but not definite (click on image to enlarge):