As of now, not many (if any). But the Genie might spur others to produce similar budget models - RG mentions the Thorens Mini at 300 Euros in the same article.
You would think ... but on the other hand Pro-Ject have been making (and selling lots of ) Debuts for 10 years. It doesn't seem to have stimulated many others to step up to the line (Goldring tried and then stopped). It could be that in one sense making a good but relatively cheap turntable is a far more difficult engineering and manufacturing problem than making yet another £1500 spinner.
Thorens have been in the budgetish end several times in the last 10 years (ironically last time with a deck built by Pro-Ject). They do seem to have a bit of an issue with managing to sell anything mind, at least in the UK.
Seriously though - Imagine I'm a music fan with a lot of vinyl. Possibly I haven't played it for some time because I don't have a deck but now I do want to (Its a very, VERY common scenario, trust me). I'm not a HiFi buff but I want something decent and £200 is about as far as I can go. I could get a Genie or a Debut, a Rega P1 or ....
Up it to £250 and the NAD comes in and maybe that new Thorens (which from what I've seen looks a little pricey for what it is next to even the limited competition).
Of course what many people in this market are doing is buying nasty Bush and Numark things (because they are unaware that there are any alternatives), getting disappointed and assuming that maybe vinyl is a bit shit after all.
If I had £1500 to spend I could choose between ... God I dunno ... 10, 20 options maybe - I'm not sure but probably as many, maybe more. Pro-Ject, Thorens, Rega, Michell, NAS, Roksan, VPI, Scheu, Clearaudio, Funk, Acoustic Solid, Acoustic Signature, Origin Live, Amazon ...
£150 for a turntable is quite expensive by the way for a lot of people, including a lot of people who listen to records. Its only in HiFi Land its considered cheap. I sell record players for a living. My market is people who listen to records, not just HiFi buffs. I seriously wish I could offer my customers more choice. I can't.