Agreed the T4 14 is a very good car (great for the club racer when you take into account less maintenance compared with some other cars) but there are 17 or so TC on the market of which at least 9 are very good cars.
Most are quality durable cars and all offer better value than Xray apart from possibly the AMX.
Whilst a new and different car would be great I doubt it will happen.
Key is better value IMO, even if the kit price remained the same but the cost of parts were reduced they would boost sales.