The 38bn is being subsidised by subscription fees - once you sign up for it, you're not just getting high speed internet for a competitive price, you're also covering the cost of the NBN - the idea that it's costing us with no benefit is a load of bull. Not to mention I'm yet to see the coalition's claims regarding their plan's ROI.
FTTN Won't be "up an running" quick - it may be quicker to build (obviously, since you're not laying fibre to the home) but the contract negotiations with all contractors, plus the negotiations to use Telstra's copper will be anything but quick.
How is using Telstra's copper better for competition when a private ISP will own all the copper needed to provide services? Under the current FTTH NBN, a government owned wholesaler will provide the services to all ISP's, at equal pricing. In terms of competition, the current FTTH NBN provides a better competitive scenario.
The current NBN 100Mb/s plan is 114.95AUD per month with iiNet with a 250GB/month usage limit - that works out to about 76 quid per month. If you're not a big user, then you can drop down to 50GB/month for the equivalent of 64 quid - you'd actually be better off than you are with Telstra at the moment on your 30Mbps plan. If, as you state, you don't need 100Mbps, then you can get their 25Mbps plan @ 50GB/month for the equivalent of 53 quid per month. But, as the statistics show, uptake of 100Mbps plans are at 40%, so people are obviously crying out for more speed. (and that's not "up to" 100Mbps - it's guaranteed).
The "up to" speeds quoted for the coalition's FTTN vary massively - the coalition has said they'd provide speeds "up to 80Mbps" - but if you live a km away from the Node, or your copper is not new (entirely likely) then you won't be seeing even half that. So you'll have forked out for a cheap and nasty NBN, and gotten no improvement on service. Not only that - but you're stuck with it, since you're unlikely to see any investment in the infrastructure for a long time afterwards (that is, after all, what the coalition is promising). And at the end of all that, they then want people to fork out even more to get the same service that is currently being built!
You don't have to be "1 of 15 people in Australia who need a 1GBps connection", you just have to be someone who doesn't want to be stuck on current speeds for the next 20 years to see the sense in investing in a full fibre network.