It’s obvious but that’s a good point 
Incoming nerd, please go on your way if you don't like numbers 😉
However, even with 1.7:1 or 1.8:1 ratios, we would still be far away from standard bikes. Let’s toy with the Total Gear Ratio concept of @Klaas_Bil!
I’m not an expert, but I have read that bikes have chain rings consisting of about 50 teeth, and smallest cogs on a cassette have around 12 tooth (more or less, depending on the rider), making a gear ratio of ~4.1. Let’s say you don’t want to use only the smallest cog, but one that’s a bit bigger. Let’s say 16 teeth => gear ratio of 3.125 - that’s an arbitrary number, but it seems to match what I’d ride on a road bike.
Let’s enter these numbers into a spreadsheet, and voilà!
| Wheel size (inches) | Wheel radius (mm) | Gear ratio | Cranks length (mm) | Total Gear Ratio (= Wheel Radius x Gear Ratio / Cranks Length) |
|---|---|---|---|---|
| 28 | 223 | 3.125 | 175 | 3.99 |
| 28 | 223 | 4.1 | 175 | 5.23 |
| 36 | 287 | 1.54545455 | 110 | 4.03 |
| 36 | 287 | 1.54545455 | 127 | 3.49 |
| 36 | 287 | 1.54545455 | 145 | 3.06 |
| 36 | 287 | 1.54545455 | 150 | 2.96 |
| 36 | 287 | 1.54545455 | 160 | 2.77 |
| 36 | 287 | 1.7 | 110 | 4.44 |
| 36 | 287 | 1.7 | 127 | 3.84 |
| 36 | 287 | 1.7 | 145 | 3.37 |
| 36 | 287 | 1.7 | 150 | 3.25 |
| 36 | 287 | 1.7 | 160 | 3.05 |
| 36 | 287 | 1.8 | 110 | 4.70 |
| 36 | 287 | 1.8 | 127 | 4.07 |
| 36 | 287 | 1.8 | 145 | 3.56 |
| 36 | 287 | 1.8 | 150 | 3.45 |
| 36 | 287 | 1.8 | 160 | 3.23 |
If you wanna match an “easy” TGR of a bike on a Schlumpf G36er, you’ll have to ride with 110’s. Good luck with that 
Let’s now say we have a new hub with 1.7 or 1.8 gear ratio. As you can see, while 150’s or 160’s may be a bit better than 145’s on a Schlumpf hub, they barely match with 127’s.
Fun fact: 160’s with a ratio of 1.8 should make you as fast as you’re already on a Schlumpf G36er with 145’s.
Although long cranks may help to get the maximum power of your legs as you can use more muscles, I’m really not sure people will go longer. I may be biased and speak only for myself, but I think unicyclists find it strange to spin long cranks. We tend to prefer smaller ones, as that’s what we’ve learned on.