That's somewhat similar to what happened in the US during the initial timeframe of DSL.
Regional Bell says your DSL is $60-120/month.
Your local ISP buys a circuit to a DSL aggregator (Covad, Northpoint, Rhythms, etc) and starts offering DSL for $50/month (their cost was $25-30/month).
After increase in customers, regional Bell says "we're offering $29.95/month for 6 months to new customers". ISPs nationwide start losing thousands of customers.
One by one, DSL aggregators start to go out of business which means ISP have no DSL connectivity and can't sell DSL anymore.
DSL is dead from anyone but regional Bell.