There are many huge cultural and socioeconomic implication of Basic Income.
Inflation is dependent on money supply, you don't need to print new money to apply basic income. You would worry as much of its inflation impact as you would for bailing out banks, if its the same printing. Its not a BI specific concern.
Pricing, on the other hand, would probably change drastically, as there would probably be a solid market of goods for people that want to get by with BI alone, so essentials will probably be priced to fit perfectly with BI.
On the second point: Basic Income is guaranteed, regardless of other jobs. So you would work at McDonalds if you wanted more money. Otherwise it creates the perverse incentive not to work which you described.
BI could be nefarious or the savior socioeconomic rule, and it deserves experimentation.
Personally, I find its socio-economic impacts the most interesting and important in shaping a society. With BI, the jobs nobody wants to do will experience a reverse Supply/Demand.
Cleaning toilets today is cheap because you have enough people that need it to survive: when they dont need it anymore, the supply for those jobs will plummet, and suddenly they will start earning way more money. I find this to be such a strong positive force that this alone justifies doing BI to me.
Also, it will very quickly destroy crime. Petty theft and small crimes have no reason to exist anymore, since you dont need to steal to eat or to try to get out of a desperate situation. Specially if being in Jail means you dont get your BI (because its used for prison budgets) it creates a magnificent economical incentive not to do crime and to get out of jail as fast as you can. Organized crime like drug dealers would likely plummet as well: as most organizations they are heavily pyramidal and require a vast number of poor people to work for peanuts and take all the risk. Take them away, and they have no supply chain, so even large organizations will get wrecked quickly. Suddenly, White-collar crime goes way higher in the scale of important.
In terms of society education, you will prevent and help millions of people to be able to pursue education without having to sacrifice it to make ends meet.
Another strongly positive force is to eliminate government "fat". Firing government employees that are useless or provide little value is a very politically expensive move no-one makes, because nobody wants to throw people on the street. Now, this is not the street anymore, they have a strong safety net so we can stop worrying about politics and focus on making things productive.
I clearly see a lot of potential on BI, and I also appreciate it could have devastating downsides. But thats what experimentation is all about finding out.