Size of public ledger

Ok
From what I understand every transaction since genesis is in the public ledger

Anyone know how many transactions in it?
How many bytes does the average transaction take to store?

Right now it looks like a minor ledger
70k trans a day
Visa n mastercard does 10k a second
800m a day

So 800m to 70k

So how many bytes does a transaction consume?

If this thing becomes 1% of gwp or 10% of visa/mc

Thats 80m transactions

So a continuous log is not realistic in big numbers

Sure tiny numbers like 70k a day no big deal

80m
8m transactions

That would be huge data load

So

Is every transaction what a new node downloads?
Ok
How many transactions since genesis
Then
How many giga or terrabytes is that file now

Minor trans like 70k a day and people cimplain the ledger too big to handle

Imagine if it does become mainstream

I dont see one big ledger working for billions of transactions

Anyone got real answers to my questions?

Or am I the only one that understands dataloads, bytes, bandwidth, drive limitations, etc