Without straying too far into the political, continued inflation, perhaps quite high, is almost guaranteed in the future. With the wild spending and money printing going on by BOTH parties in government, inflation is simply a fact of life, despite what our leaders say.
If this is true, pinball manufacturing costs will also continue to rise, maybe significantly, and corresponding new pinball list prices will rise as well. Raw materials, labor costs, energy, etc will all play a part in these price increases. This means that it is likely, but not guaranteed, that pinball resale prices will similarly rise. The saying is a rising tide floats all boats.
Assuming that the game in question is seen as desirable by homeowners, operators, and collectors, and is in good condition, it should participate in this inflationary price increase. In the case of Bond specifically, I personally have no idea if it is desirable having not yet seen or played one in person. It's a popular theme so I suspect if Stern does a good job, it should do well.
Of course, pinball price increases do not necessarily equate to good investments. Will the price increases keep up with the real inflation rate? If not, it may be worth more money, but it is not a good investment. Traditional areas considered good investments are stocks, precious metals (sometimes), land or property, and some universally desirable tangible items like very high end art, collector cars, Swiss watches, etc.
As others have said, buy a pinball if you really like it and want to play it. If it sells for what you paid for it or even more some years down the road, that's great. But it might or might not have been a "good investment"!