I don't think the V4 will compete an a purely performance level with the offerings from other companies. They will once again be an exclusive brand. Only individuals with the cash, and the desire to own something special will be buying V4s. Young kids who want a sportbike/superbike will not be able to afford £40. Obviously, this means Norton will not be selling 10,000, or 15,000 or so units like Honda, Yamaha, Suzuki, even if they had the capacity to manufacture that many, and they don't and won't.
If Norton do succeed and produce a reliable, and powerful (albeit less powerful than other superbikes) V4, there will be dealers who will be willing to sell them on a per unit basis, without factory dealerships. However, the V4 will have to be reliable, and Norton will have to offer parts to these dealers.
Initially, the V4 buyers will be people who know the Norton brand, or at least know of the Norton history. So this means older folks who have sufficient disposable income. These folks will especially enjoy the exclusivity of the brand (low production numbers.) If the bike is met with good press and reviews, the general biking public will take notice, and others who can afford the brand, but who may not be familiar with the Norton brand will become interested, as either a collectible, or an investment.
Everything depends on the product having modern features, performance, and reliability, no excuses!