In the Philippines, bahay kubo is the national house and it is also considered one of the folk song of the country. So the reason why bahay kubo did not became the national folk dance probably because it was considered as Awiting Bayan rather than a dance.
Instead of Bahay Kubo, Cariñosa became officially the national folk dance of the Philippines. It rooted from one of the colonizers, the Spain. One of the legacy of Spain is most probably the Cariñosa dance. Like a baby, there is always something good trait it can inherit from its mother.
So let's embrace it rather than accused it or change. Changes will always incur costs specially in our very own identifies. Like changing the national language from Tagalog to Cebuano or something else will require huge amount. It will displace also the Talagog or Filipino subject teachers as well, and will eventually need trainings for new Cebuano teachers if this will happen in the future.
What changes should be expected rather?