I don't understand why everybody feels this will be good for values of traditional Morgans. To be honest, I don't feel that way.
Second hand Morgans will (in my personal view) mainly go to new Morgan customers.
If they have a choice between a second hand steel-chassis Plus 4 and a CX PlusFour with better handling, more safety features and a better engine I'm not sure if they see the uniqueness of the original trad.
I would probably go for the CX (if I could afford it at that moment).
Its basic supply and demand. There are very few trads on the market at any one time and when the production of trads ends, the number of trads will never increase making it an even more limited market.
Secondhand prices are also linked to the price of new cars as well as supply of cars. A new 4/4 Sport for example cost £27,500 in 2008 but the new price of a similar model had increased to £40,000 at the end of production in 2018. The low numbers of cars on the market (supply) and increase in list price is why a 2008 4/4 Sport is still worth in the region of its cost new in 2008 today.
With the introduction of the CX chassis, some dealers are talking about a 50% increase in price of the new CX equivalents to current trads. This should firm up or even increase the price of late trads (which have become instant classics!) and will work its way down to earlier models many of which have reached an age where they have stopped depreciating in value anyway.
All very academic however as we havent bought our trads primarily as investments.
The CX chassis on the otherhand is a bit of an unknown. You might expect them to hold their value as the trads had done before based on a limited supply of cars. The only problem is that if prices of the CX replacement for trads increase to circa £60,000 for a base model, then you are into a different market with lots more choice for buyers and even more so with the £80,000 + Plus 6's
