Its like you've never even looked at the Space wolves, all thier units are unique except the vehicles. The BA have unique special rules and units to represent how they diverge, and its quite a bit, they're barely contained space vampires, always one step away from transforming into frothing, blood drinking loonies or going totally mad and thinking they're the Primarch and the battlefield is horus battle barge, so it has units and rules to represent tht fluff, and those armies are popular enough to warrant their own codex.
Yours isn't.
The Templars have one unique unit and some HQs, if you want to have a BT army, don't take Devs or scouts, swap your Sergeants CCW for a Bolter and there you go, mission accomplished.
The fact of the matter is, as of speaking, the UK site has BT units as a section of the Space Marine army, where all of those other chapters have thier own section.
You're not looking at this objectivly, you're passionate about your army and thats great, but its blinding you to the facts, the other armies you mentioned, although they follow the Codex Astartes (except SW, they're like the original non-codex chapter!), all differ in following it and have rules to represent that uniqueness, you obviously haven't looked into the other armies and are making snap judgements.
No one is saying they will scrap models, I don't doubt they will always be available, but given that they're in the Codex Space Marine section now, I'm sure we'll see them rolled into the new Codex Space Marines, I think we'll be seeing something very different and cool from the new C:SM when it shows up