That would really depend on what the dealer wants to do with the line. It is unlikely that Triumph alone can support a larger dealer unless they are wildly popular in a 12 month per year riding climate. There may be exceptions.
A good example is Pure Triumph in Fort Lauderdale. Very large super well run dealer on Route 1 at the beach. They just took on Ducati, I think, and barely got by on just Triumph. You can imagine the rent, insurance, utility payments, workers comp etc. You have to sell a lot of bikes to make money.
20 bikes for Triumph in a month is a lot! Figure $1,000 per bike. $20,000 per month on sales is a drop in the bucket when supporting a big building and staff. + you have to do it every month!