No need for that. Famine's explanation of what KY told him gives a strong indication that they are counting tracks just like they did with GT PSP.
It's a good sign, because GT PSP had most of GT4 tracks and the count was 45, then the variations to get to 72.
If GT5 starts with 70, with the reverses it will go above 100.
What you've said here is actually funny because I've got GT PSP in front of me right now and I count 45 tracks total (including variations = short / east / west / road / old). I've checked and not all of these tracks have a reverse (backward) layout and I can't be bothered to count those, however *including reverse* a total of 70 - 80 tracks or so would be about right.
As I said, I don't see it being difficult to believe that we'll get 35 - 40 default tracks (including short / east / west / road / old versions) and the total number of variations (i.e. the 70+ touted by KY) would include the reverse versions for those.
Here's the PSP list. Sorry it's not tidier, I just tapped it out as I read it from the PSP screen.
1.apricot hill........2.autumn ring................3.driving park beginner...............4.autumn ring mini
5.cote d'azur........6.cathedral rocks trail 1.................................................7.cathedral rocks trail 2
8.cathedral rocks trail 3..........................................................................9.valencia
10.chamonix.......11.sarthe old..................12.sarthe 2005.........................13.costa di amalfi
14.citta di aria.....15.deep forest................16.el capitan............................17.fuji 90's
18.fuji f...............19.grand canyon.............20.g.valley speedway...............21.hs ring
22.g.valley east....23.ice arena...................24.infineon sports car course.....25.midfield
26.lag seca..........27.driving park mland......28.new york............................29.opera paris
30.nurburgring.....31.seattle.......................32.seoul.................................33.suzy
34.suzy east........35.suzy west...................36.swiss alps..........................37.test course
38.tahiti maze......39.r246..........................40.trial mtn............................41.tsukuba
42.twin ring motegi east short.....................43.twin ring motegi road
44.twin ring motegi super speedway.............45.twin ring motegi west short
I don't think we'll see all of these tracks in GT5 but then we know there are alternatives in GT5 such as London, Madrid & Eiger. I think that quite simply, we'll see some more variations of the tracks we've seen already. For example: Indy & Daytona have at least 2. Suzy I hope will have all 3 variations, Nordschleife also has GP, etc... I think if someone were to take all the tracks we'd seen so far in the demos, then threw in a couple of variations on some of these, we'd be almost there. Don't get me wrong, I do think there's a few reveals left in as far as famous circuits go (which may have another variation or two as well) and with the High Fens "Course Maker" theme being available I am hoping (expecting?) to see Spa on release day if not before.