The numbers I'm hearing in terms of additional cost for the perovskite layer is a penny or two per watt, which is less than the variation in price between modules from suppliers out there, especially if we factor in modules made here in the US or countries outside of China. Price range for N type modules right now range from 7 cents to 10 cents/watt so I see cost being a factor that can be overlooked. The long-lasting part you mention is a little harder to consider, this is where companies like SunPower and other "premium" suppliers get to really charge a hefty surcharge with carrots like 40 year warranties, for whatever that's worth, some developers are more than willing to buy in to that, others don't really care. I think in this day and age, pretty much all the tier 1 module suppliers offer 25 year/>80% power output guarantees, if not, much higher, and if it's a tandem junction anyway, you'll still have that silicon layer's output that's well known/mature enough to fall back on.
I think initially, that's what these modules makers will push with the tandem junction panels, that higher efficiency value. These N-type modules all put out 25 year/>87% numbers, if they're achieving 25 year/>80% with the perovskite layer, should be good enough. Now that there's a factory built specifically for the production of these panels, I suppose we'll find out soon enough if the numbers work to justify the production/sales of these panels. We're kinda screwed over with all the tariffs here in the US and the loss of tax credits, but if the rest of the world can get their hands on 27-30% efficiency modules at under 10 cents/watt, LCOE per kwh for solar will drop below a penny, that'd be pretty frickin amazing! *of course, not factoring storage