The taxonomists are changing the generic name of the non-Vanda species so that the genus Vanda makes more sense as an evolutionary unit. They are not just doing this 'for fun'.
In the phylogenetic classification of organisms, a genus, or any other taxonomic group (family, class, order, etc.), needs to be composed of all the species derived from a single common ancestor. All these scientists are saying is that the way that makes most sense evolutionarily speaking is to include all these species under a single genus, Vanda.
If orchid growers and other people in the horticultural trade keep using the currently common generic names, the taxonomists are not going to care. If the new classification is generally accepted in the scientific community, the taxonomists will just regard the horticultural names as synonyms.
There's really no need for a conflict, here.
--Stephen