It's possible that the House is holding until after the 2020 election in hopes of picking up a few Senate seats in the election that would change the landscape. Doesn't appear to be going in that direction but we are a fickle electorate.
Another possibility is the House hopes to use the Articles as a hammer to pressure the President toward their will.
In either or both cases, it seems the House should be compelled to "put up or shut up" otherwise upsetting the co-equal balance as designed. The president should sue for performance making the argument.
Impeachment would die with this Congress. They’d have to vote again after the new Congress is sitting.
Someone on FNC said they have 2 months or 2 weeks before the election to deliver it to the Senate.
A reporter on FNC just said the House can keep the articles of impeachment from the Senate indefinitely. Pelosi is a Fool.